1000 resultados para Epstein, Jean


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The latent membrane protein 1 (LMP1) encoded by the Epstein-Barr virus functions as a constitutively activated receptor of the tumor necrosis factor receptor family. LMP1 is a short-lived protein that is ubiquitinated and degraded by the proteasome. We have previously shown that LMP1 recruits the adapter protein tumor necrosis factor receptor-associated factor 3 (TRAF3) to lipid rafts. To test if TRAFs are involved in LMP1's ubiquitination, we have mutated the LMP1 CTAR1 site that has been identified as a TRAF binding site. We show that the CTAR1 mutant (CTAR1(-)) is expressed after transfection at a similar level to wild-type LMP1, and behaves as wild-type LMP1 with respect to membrane localization. However, CTAR1(-) does not bind TRAF3. We demonstrate that ubiquitination of CTAR1(-) is significantly reduced when compared to wild-type LMP1. In addition, the expression of wild-type LMP1 induces the ubiquitination, an effect that is significantly reduced when the CTAR1(-) is expressed. Taken together, our results suggest that TRAF proteins are involved in the ubiquitination of LMP1, and that their binding to LMP1 may facilitate their own ubiquitination.

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Comprend : [Page de titre frontispice avec figures allégoriques et mythologiques. Architecture. Aigle.] [Cote : BNF C31522] ; [Carte entre les pp222-223]. La carte de Berry [Cote : BNF C59825] ; [Planche dépliante p.227]. PI IX. Pourtrait de la ville de Bourges. [Vue de Bourges. Planche attribuée à Jean Arnoullet.] [Cote : BNF C468]

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Comprend : [Page de titre avec vignette. Vaisseau naviguant sur une mer agitée. Rose des vents.] [Cote : BNF C18135]

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Comprend : [ Planche dépliante. Anatomie de la femme enceinte : dissection. Représentations du foetus dans la poche placentaire et d'un nouveau-né. XVIè siècle.] [ Cote : BNF C 58707. ]